抗压桩承载力可靠度指标分析

结合广东河（源）龙（川）高速公路工程实例，运用蒙特卡罗法，对抗压桩可靠度指标进行分析。分析表明：可靠度指标对场地承载力不定性、桩侧摩阻力和桩端阻力计算模式不定性的均值、变异系数均敏感；荷载变异系数对可靠度指标有较大影响。此外，得出可靠度指标较安全系数更能符合抗压桩的客观实际。

Reliability Index Analysis of Bearing Capacity of Press Pile

Based on engineering examples, the paper describes the reliability index analysis of press pile with Monte-Carlo method. The result indicate that the reliability index is sensitive to the average and varia tion coefficient of uncertainty of soil bearing capacity, calculation mode of lateral resistance and calculation mode of tip resistance of pile, and the variation coefficient of loading has major influence on reliability index. Besides, the reliability index is closer to objective practice of tension pile in comparison with the factor of safety.